Dans is currently price matching/beating (I think First Choice @ $16.70) the Grant Burge Pinot Noir Chardonnay fizz - now down to $16.65 when bought as part of six. Pretty decent deal. Potentially even better if you use one of the cashback places like http://qwibble.com.au/dan-murphys (ex buckscoop) - at 9.9% that should make it (eventually - it's automatic, but can take a while to get the cash back) just over $15 per bottle….
Genuine Champagne available at Aldi for $20. Enjoy it while the A$ is strong. You may never see it this cheap again in your lifetime!
PS Keep the foil at the top of the bottle and stick it on cheap bubbly in future for that Champagne moment again. Nobody will know the difference, but will always be impressed by that 5 letter name!